In this example, N is 10 and N-1 would be 9. The result is a sample variance of 82.5/9 = 9.17 and a population variance of 8.25. Note that the standard deviation is the square root of the variance ...

and a population variance. In this module you will learn how to estimate parameters from a large population based only on information from a small sample. You will learn about desirable properties ...